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Old 01-23-2022, 10:14 AM   #1
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Aqua-hot system

HELP! When prepping to leave the cold weather I got a low coolant level message when starting the heating system. I hadn't done anything since having the coach winterized in November. My suspicion is that whoever did the winterization drained the entire system. I have been adding the polypropylene glycol and it seems to be an endless process. I have looked for leaks and cannot find any. I have so far added 7 gallons to no avail. Can anyone give me an approximate total capacity required for a 39 foot diesel pusher. It's a Tiffin Allegro RED. Thank you for any input.
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Old 01-23-2022, 10:23 AM   #2
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The Aqua Hot is a hot water boiler in its design. That means "boiler tank" in the Aqua Hot, plus all the lines. It should have not been drained. Don't know that I've ever seen the capacity of the tank, but at 7 gal., you should be getting close.

Get someone else to winterize next year, and you might expect more problems, from his lack of knowledge.
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Old 01-23-2022, 10:31 AM   #3
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I hope I'm getting close. Thanks.
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Old 01-23-2022, 10:36 AM   #4
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Aqua Hot

I hope you did not turn on the switch for electric heat.
If so the heating element more than likely is burnt out.
I have a 450D the last time i changed out a pump I put about 4 1/2 gallons back in to get it full. My lines to the radiators were not empty so that may be the extra 2 gallons.

Good luck
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Old 01-23-2022, 10:37 AM   #5
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Found in the manual, about page 110, that the 400 takes about 5 gal., that is for the tank, then add whatever is needed for the lines. Good luck. You'll also need to do purging of all the lines, which is all described on about page 110 of the manual.
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Old 01-23-2022, 11:45 AM   #6
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Found in the manual, about page 110, that the 400 takes about 5 gal., that is for the tank, then add whatever is needed for the lines. Good luck. You'll also need to do purging of all the lines, which is all described on about page 110 of the manual.
Thank you. I have a 250D. I would suspect the capacities would be similar. Wish me luck.
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Old 01-23-2022, 11:47 AM   #7
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I hope you did not turn on the switch for electric heat.
If so the heating element more than likely is burnt out.
I have a 450D the last time i changed out a pump I put about 4 1/2 gallons back in to get it full. My lines to the radiators were not empty so that may be the extra 2 gallons.

Good luck
It seems that the plumbing to the heat exchangers were empty as well. I certainly wasn't expecting this dilemma to arise. Thanks for your help. Have a great day.
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Old 01-23-2022, 12:03 PM   #8
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I'd be having a word with whoever 'winterized' your coach, and asking if and why they drained your boiler fluid !
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Old 01-23-2022, 01:30 PM   #9
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Originally Posted by DonR View Post
I hope you did not turn on the switch for electric heat.
If so the heating element more than likely is burnt out.
I have a 450D the last time i changed out a pump I put about 4 1/2 gallons back in to get it full. My lines to the radiators were not empty so that may be the extra 2 gallons.

Good luck
It seems that the plumbing to the heat exchangers were empty as well. I certainly wasn't expecting this dilemma to arise. Thanks for your help. Have a great day.
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Old 01-23-2022, 08:06 PM   #10
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Sheesh! I’d be pretty upset. I’m guessing my 450 will hold around 7-8 gallon all in, so hopefully you’re getting close. I’d be interested as to how much you end up using. The blue wire on each pump will run the pump if you take that to ground (process in the manual).

Depending on what transfer fluid you’re using, you might check camping worlds price. I just scored 7 gallon for ~$180 to my door. SUPER cheap compared to everywhere else. That was for the premix by the gallon.
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Old 01-23-2022, 08:21 PM   #11
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You should go to Aqua Hot and download their installation manual. It's a good guide to filling your system. The best way to fill is by pushing fluid in through the drain and letting air escape through the top. Also keep in mind that the pumps in your Aqua Hot are not self-priming. Therefore you need to get the entire system pretty darn full of fluid before fluid will circulate. One more thing, you should use a refractometer to dial in the correct boiler fluid concentration. The correct level is about -33 F freezing point. Any lower and the pumps will struggle with moving the fluid and you'll lose heat transfer capacity. It's pretty much all in the Aqua Hot manuals. Here's a link.
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Old 01-23-2022, 08:45 PM   #12
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On a positive note some have had the fluid get gummed up you will be fresh.
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